What is a common clue that an officer might hear during the phase two interview?

Slurred speech is commonly observed during the phase two interview of a DUI investigation. This clue indicates that the driver's ability to articulate words is impaired, which can be due to intoxication or the influence of substances. Officers are trained to be attentive to verbal cues during interviews, as they can provide significant insight into a person's level of impairment. Slurred speech suggests a lack of coordination and control over motor functions, which aligns with signs of intoxication.

The other options may provide relevant physical observations or clues, but they do not specifically relate to the verbal aspect of communication during the interview. While fumbling fingers can indicate a lack of manual dexterity, and bruises or soiled clothing could suggest an altercation or lack of care, slurred speech directly addresses the cognitive and physical impairments associated with alcohol or substance influence, making it a vital clue in assessing a driver's impairment.